Compressor



Aug. 14, 1934. G; E. TUBBS ET AL 1,970,260

COMPRES SQR Original Filed June 6, 1932 2 Sheets-Sheet l T e u a.

. Treg B. Wovomg M y a f A W Aiiomeg Aug. 14, 1934. G. E. TuBBs w A;

COMPRES 5 OR Original Filed June 6. 1932 2' Sheets-Sheet 2 Caeor Trad Patented Aug. 14, 1934 l 1,970,260

COMPRESSOR George E. Tubbs and Fred I. Brown, Hillsdale, MiClL; said Brown assignor f one-sixth to said Tubbs Application June 6, 1932, Serial No. 615,630

Renewed July 5, 1934 3 Claims. (Cl. 230--221) This invention relates to compressors and in outlet passage 12 therethrough all as shown in particularly concerned with a very durable and Fig. 1. I simply and economicallyconstructed compressor, In the casing an eccentric 13, mounted on a useful in refrigerating units. shaft 14, indicated in dotted lines, is located, It is a primary object of the present invention and a piston rod at its lower end has a ring to provide an exceedingly economical, durable and section 15a over the eccentric 13 whereby on practical compressor and one which is partiourotation of the shaft 14 the piston rod is reciplarly useful in compressing gases in a refrigeratrocated and the piston 16 connected therewith ing system or unit such as is used in relatively is moved up and down in the cylinder 5. i -small refrigerators as in households, dispensing The piston 16 at opposite sides and at its inner 65 7 with the use of ice as a refrigerant. portion has integral vertical bosses 1'7 terminat- The construction embodying our invention ing at their lower ends in cylindrical bosses 18 may be understood from the following descripsimilar to and having thesame purpose as wrist 'tion, taken in connection with the accompanying pin bosses. Each of the bosses 1'7 has a vertical drawings, in which, 7 passage 19 therein extending to and communi- 70 Fig. 1 is a central vertical section through the eating with the horizontal openings through the compressor of our invention. bosses l8.

Fi 2 i a ver l secti n throu h the c m- A tubular member 20 extends transversely pressor piston, substantially on the plane of the through the upper end 21 of the piston rod 15, 2d broken line 22 of Fig. 5. which upper end is bored and machined for 75: Fig. 3 is a vertical section on the plane of line the passage of the member 20. An opening 22 3-3 of Fig. 4] through a side of the tubular member 20, sub- 4 is a vertical section substantially on the stantially midway between its ends, is in conjuncplane of line 4-4 of Fig. 2. tion with an entrance opening 23 in the upper 25 Fig. 5 is a horizontal section through the upper part 21 of the piston rod. The tubular member 20 so i p portion of the piston. is held fixed with relation to the piston rod by 6 iS Section O the p st 'Od an e a pin 24 connecting the sameas shown in Fig. 3. sleeves associated therewith in connecting it op- The tubular member 20 adjacent each end is proeratively with the piston, the section being on the vided with further openings 25, as shown. a

Same plane as in Fig. 2 but showing t piston Around each end of the tubular member 20 is 85-.- rod in a different position with relation to the a tubular sleeve 26 secured in the boss-18 and piston. extending therethrough, the inner ends of the 'Figis a fragmentary P View Of the SleeVeS sleeves 26 coming to the ends of the upper portion interposed betWeeh the piston rod d t p 21 of the piston rod, while the outer ends of the ton, and sleeves are shaped in conformity to the outer sur- 9O 8 is a V w, Similar t Figs- 2 d 6, showface of the piston and to the inner walls of the ing the position of the parts when the piston rod cylinder 5 in which the piston is located. The is at a dead center at either the upper or lower sleeves 26 have openings 27 in conjunction with position of the piston. the passages 19 shown in Figs. 2 and 4. Like reference characters refer t 1 parts in The valve 9 within the casing or valve chamber 95" the different figures of the drawings. 10 in structure includes an inverted U-shaped In the construction of the compressor a casing housing with an Opening P i as Shown 1 is provided, closed at its lower end by a base a threaded rod or bolt 29 withln said casing and plate 2, and having an inlet 3 with a passage extending at its upper end through the upper side 4 at the upper portion of the casing L A cylim thereof, a compression spring 30 between the head 1001 der 5 integral with said casing 1 extends vertiof the bolt at Its lower end and the upper Slde of cally therefrom terminating at its upper end in the Casing and also member 31 thm sheet metal, three in number, the lower of which is an annular outwardly extendmg flange A fiat of convex form looking at its upper side, the in Plate 7 covers the upper end of the cylinder termediate one of plane form and the upper of 105-= tends Over th flange 6 a has a central Openconcave form viewed from its upper side. The i 8 therein Over which is a Va ve, e e a y specific structure of this valve is not concerned ndicated at 9, which normally closes the openin the present invention as it is to be the subject m A us 0 s located Ov e plate matter specifically of a further application for 'Z and the valve 9 and has an outlet 11 with an patent, 0-

The shaft 14 is rotated from any suitable source of power whereby there is caused a reciprocation of the piston 16. With the piston rod 15 changing position by reason of the movement of the eccentric 13, the tubular member 20 secured to the piston rod is rocked back and forth so that at certain times the openings 25 and 27 are in conjunction, and at other times out of conjunction with each other. At the upper and at the lower positions of the piston the openings 25 and 2'7 are not in conjunction but are as shown in Fig. 8. On the down-stroke of the piston openings 25and 27, being closed to each other for a short period,

a high vacuum will be induced'in the cylinder 5 above the piston so that when said openings 25 and 2'7 either partly or wholly come into conjunction the gaseous refrigerant enters through the passages 19 to the chamber above the piston; Then on the Lip-stroke when the openings 25 and 2"Iare again closed to each other such gases above the piston are heavily compressed and lift the valve so as to pass through the opening 8 and thence outwardly through the outlet passage at 12.

This construction of compressor is of a very simple and economically manufactured form. It is silent in operation at high speeds, wear is re-- duced to a minimum with maintenance cost reduced to its lowest point, whereby the compressor is very durable and dependable and positive at all speeds both high and low. The valve at 9 is positively sealed, there is no chance for deposit on the valve seat or face and there is assurance of continuous operation under most severe and exact operation conditions. The tubular member 20'whicl'r serves the purpose of a wrist pin is of ample size to provide a large bearing surface, this enhancing the durability of the compressor; The materials used are suitable alloys that resist chemical action, it being understood that the re frigerating fluid, such as sulphur dioxide 'or other suitable refrigerant must be taken-into'ac'count" in the design of the compressor. The construction is very easily manufactured, the parts being readily and easily machined, quickly and easily ings therethrough, and'said'tubular piston pin having openings in a side thereof adjacent each,

assembled and there'are no parts'to get out of order. The test and trial of the compressor has shown the same to be exceptionally satisfactory, particularly durable and exceedingly economical both in manufacturing cost and operationi The invention is defined in the appended claims and is to be considered comprehensive'of all forms of structure coining within'thei'r scope.

-We claim? I 1. In a compressor'compris'ing, an enclosed oasing having an inlet thereinto, a cylinder extending from the casing and in communication therewith, a piston in the cylinder, said cylinder having an opening in its outer end, a valve normally closing said opening, the combination of means for reciprocating the piston, including a piston rod and connections between said piston rod and piston, said connections comprising, a tubular piston pin having communication with said casing and an outlet opening therein, and said piston having a passage leading from said tubular piston pin to the upper end of the piston, there being connectionsbetween the piston rod and piston pin for rocking the piston pin on reciprocation of the pistonto periodically open and close communication between said passage in the piston and. the outlet opening in the tubular piston pin.

2; In'combination, a piston having a closed upper end and a depending skirt, and having inwardly extending wrist pin bosses and also having vertical bosses extending downwardly from the upper end of'the piston to wrist pin bosses, there being vertical passages from the upper end of the piston to and through a side of said wrist pin bosses, a tubular piston pin located in and extending between said wrist pin bosses having openings adjacent itsends and at one side, a sleeve around each-end of the'tubular piston pin secured in eachoi said wrist pin bosses and having openings in communication with said passages, and a piston rod secured to said tubular piston pin between the ends of said sleeves, said tubular piston pin and adjacent portion of the piston rod having alined openings therethrough, for the purposes specified.

3. In combination, a'piston located in a cyl inder having downwardly extending diametrically opposed bosses at itsinner sidesterminating in cylindrical wrist pin bosses, said'bosses having longitudinal passages therethrou'gh," a tubular nit? piston pin extending through said wrist pin bosses, a piston rod having an upper end portion in the form of a sleeve, means securing the piston rod and the tubular piston pintog ether, Y

saidpiston pin and'sleeve having alined openin the'w'rist pin bosses and having openings in GEORGE E. TUBBS. FRED I. BROWN;

conjunction with the passages in the piston bosses. 

